A 28-year-old man, arrested after a fire on board a ferry to the Netherlands, has been bailed.
He was questioned on suspicion of affray after a fire in a cabin on the DFDS MS King Seaways on Saturday night.
A 26-year-old man, arrested on suspicion of arson, remains in police custody.
More top news
The pair defrauded Durham County Council out of nearly £100,000 but were given suspended sentences.
Gascoigne is alleged to have sent abusive tweets, text messages and telephone calls to Amanda Thomas in March this year.
The Black Cats are attempting to find their seventh permanent boss since the Irishman's departure.